JP3400172B2 - Combustion equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unburned component concentration detecting means for detecting the concentration of unburned component in combustion gas of a burner, and the burner of the burner based on the detection information of the unburned component concentration detecting means. The present invention relates to a combustion device provided with incomplete combustion determination means for determining incomplete combustion.

[0002]

2. Description of the Related Art Conventionally, in the above combustion apparatus, as shown in Japanese Utility Model Laid-Open No. 5-90148, when the burner is not in a combustion state, for example, before the combustion of the burner, the unburned component concentration detecting means is detected. The output value of the unburned component concentration detection means when the power is turned on and the burner extinguishes,
In some cases, the zero point reference value is rewritten and stored, and incomplete combustion is determined based on the deviation between the output value when the burner is in the combustion state and the zero point reference value.

In such a configuration, the combustion gas of the burner contains a harmful substance such as sulfur, and the unburned component concentration detection means continues to perform the unburned component concentration detection operation. As such harmful substances adhere to the surface, the detection capability deteriorates.In a state where the unburned component is predicted to be zero, the zero reference value is sequentially rewritten and stored to determine the unburned component concentration. This is to enable effective detection.

However, when the unburned component concentration detecting means deteriorates due to the harmful substance as described above, not only the zero point reference value changes but also the sensitivity characteristic, that is, the unburned component concentration changes. The change characteristic of the output value with respect to (for example, the slope of the change characteristic) is deteriorated. However, in the above-described conventional configuration, the zero-point reference value is only rewritten sequentially, and the sensitivity characteristic as described above is Since the deterioration is not taken into consideration, there is a disadvantage that the detection accuracy of the unburned component concentration becomes low.

Therefore, as a means for eliminating such a disadvantage, for example, Japanese Patent Application No. 6-116796 by the present applicant.
The improved configuration shown in the issue was considered. That is, the output value of the unburned component concentration detection means when the unburned component is predicted to be zero is stored in advance in the storage means as the output reference value, and then the unburned component is in the zero state. The deterioration of the unburned component concentration detection means is determined based on the output value of the unburned component concentration detection means and the output reference value. The output reference value as described above is stored in the storage means in advance in the production process until the combustion device is manufactured in a factory or the like and shipped.

[0006]

However, even the above-mentioned structure still has the following disadvantages, and there is room for improvement.

While the combustion device is manufactured, shipped, and then installed at a place of use, transportation and installation work by a vehicle or the like will be carried out. At times, the device may vibrate or receive an impact, and the detection characteristics of the unburned component concentration detecting means may change due to such vibration or impact. For example, the output value when the unburned component concentration is predicted to be zero is
There is a risk of deviation from the output value at the production stage.

However, in the case of the above-mentioned conventional configuration, since the output reference value is stored in advance at the shipping stage, when determining the deterioration after installation, the deterioration including the characteristic change due to vibration or shock is included. It is necessary to make a distinction, and there is a possibility that it may not be possible to accurately identify deterioration caused by use.

The present invention has been made by paying attention to such a point, and an object thereof is to provide a combustion apparatus capable of accurately discriminating the deterioration of the unburned component concentration detecting means caused by the normal use. In point.

[0010]

The features of the first invention are as follows:
Unburnt component concentration detection means for detecting the concentration of unburned component in the combustion gas of the burner, and incomplete combustion determination means for determining incomplete combustion of the burner based on the detection information of this unburned component concentration detection means In the combustion apparatus equipped with, the installation initial state determination means for determining whether or not it is in the initial state installed in the use position, and the installation initial state determination means determines that the installation initial state. And, the initial reference value setting means for setting the output value of the unburned component concentration detection means when the unburned component is predicted to be zero as an initial reference value, and the initial reference value is set. After that, based on the deviation between the output value of the unburned component concentration detection means when the unburned component is predicted to be zero and the initial reference value, deterioration of the unburned component concentration detection means Deterioration determination means to determine is provided Are located in the points are.

The characteristic configuration of the second aspect of the invention specifies a configuration suitable for carrying out the first aspect of the invention, wherein the installation initial discriminating means sets the burner to an initial combustion state after being installed in a use position. It is configured to determine whether or not it is in the initial state of installation based on whether or not

A characteristic configuration of the third invention is to specify a configuration suitable for carrying out the second invention, wherein the initial reference value setting means stops the combustion operation of the burner in the initial combustion state. After the set time has elapsed, the output value of the unburnt component concentration detecting means when the unburnt component is predicted to be zero is set as the initial reference value. .

The characteristic configuration of the fourth invention specifies a configuration suitable for carrying out the first, second or third invention, and is provided with integrating means for integrating the combustion time of the burner, and the deterioration is caused. The determination means is configured to determine deterioration every time the integrated combustion time of the integration means reaches a set time.

The characteristic configuration of the fifth invention is that the first, second, and third
Or, it is intended to specify a configuration suitable for carrying out the fourth aspect of the invention, and when the deterioration determining means determines that the deviation between the initial reference value and the output value exceeds a set amount, the abnormality is notified. It is configured to output information for doing so.

The characteristic constitution of the sixth invention specifies a constitution suitable for carrying out the first, second, third, fourth or fifth invention, wherein the unburned component concentration detecting means is contacted. It is composed of a combustion type CO sensor.

[0016]

According to the characterizing feature of the first aspect of the invention, after being installed at the use position, the installation initial state determining means determines that the installation is in the initial state, and the unburned component is predicted to be zero. The output value of the unburned component concentration detecting means at the time of resetting is set as the initial reference value. Then, after the initial reference value is set, the output value of the unburned component concentration detection means when the unburned component is predicted to be zero,
Deterioration of the unburned component concentration detecting means is determined based on the deviation from the initial reference value.

According to the characterizing structure of the second invention, the following function is obtained in addition to the function of the characterizing structure of the first invention. After installation, it is determined whether the installation is in the initial stage or not based on whether the burner is in a combustion state (initial combustion state) accompanying initial use. It is not necessary to provide a dedicated operation means or the like for determining that the installation is in the initial state based on the above.

According to the characterizing structure of the third invention, the following function is provided in addition to the function of the characterizing structure of the second invention. Since the output value of the unburned component concentration detection means is set as the initial reference value after the set time has elapsed since the combustion operation of the burner in the initial combustion state was stopped, after that,
In almost the same situation where the initial reference value was set,
It is possible to detect the output value for the deterioration determination, and it is possible to match the respective detection conditions of the output values compared for the deterioration determination.

According to the characteristic constitution of the fourth invention, the first and second
Alternatively, the following operation is provided in addition to the operation according to the characteristic configuration of the third invention. Each time the burner cumulative time reaches the set time,
The deterioration of the unburned component concentration detecting means is automatically determined.

According to the characterizing feature of the fifth invention, there is the following effect in addition to the effect of the characterizing feature of the first, second, third or fourth invention. When it is determined that the deviation between the initial reference value and the output value exceeds the set amount, it is determined that the unburned component concentration detecting means is significantly deteriorated, and information for notifying an abnormality is output. Therefore, it is possible to let the user recognize that the abnormal state is greatly deteriorated in this way.

According to the characterizing feature of the sixth aspect of the invention, the following effect is obtained in addition to the effect of the characterizing feature of the first, second, third, fourth or fifth aspect. By using the contact combustion type CO sensor as the unburned component concentration detecting means, the CO (carbon monoxide) concentration in the combustion gas as the unburned component can be detected directly and accurately, and the incomplete combustion of the burner can be performed. Can be accurately detected.

[0022]

According to the characteristic constitution of the first invention, vibration, vibration, etc. are caused in transportation and installation work before installation.
If the detection characteristics of the unburned component concentration detection means have changed due to impact, etc., or due to individual differences in the unburned component concentration detection means Even if there are variations, an accurate initial reference value is set at the start of use, so an accurate initial reference value will always be set when the product is installed and started to be used. Since the deterioration is determined based on this initial reference value, it is possible to provide a combustion device that can accurately determine the deterioration of the unburned component concentration detecting means that occurs with the use of burning the burner.

As a result, for example, in the case of correcting the sensitivity (the inclination of the change characteristic of the output value with respect to the change of the unburned component concentration) according to the above deterioration, there is an advantage that this sensitivity correction can be performed accurately.

According to the characterizing structure of the second invention, the following effects are obtained in addition to the effects of the characterizing structure of the first invention. It is possible to effectively determine whether or not it is in the initial stage of installation without inviting a complicated structure.

According to the characterizing feature of the third invention, the following effect is obtained in addition to the effect of the characterizing feature of the second invention. By matching the respective detection conditions of the output values compared for the deterioration determination of the unburned component concentration detection means, it becomes possible to further improve the accuracy of the deterioration determination.

According to the characteristic configuration of the fourth invention, the first and second aspects are provided.
Alternatively, there are the following effects in addition to the effects of the characteristic configuration of the third invention. For example, as compared with the case where the deterioration is determined based on an artificial command operation, the deterioration can be surely determined without the troublesome operation.

According to the characterizing structure of the fifth invention, the following effects are obtained in addition to the effects of the characterizing structure of the first, second, third or fourth invention. When the unburned component concentration detecting means is greatly deteriorated, the user can recognize the fact, so that the subsequent maintenance work such as repair and replacement can be performed quickly.

According to the characterizing structure of the sixth invention, the following effects are obtained in addition to the effects of the characterizing structure of the first, second, third, fourth or fifth invention. The incomplete combustion of the burner can be accurately determined, and the disadvantage that the combustion of the burner continues for a long time in the incomplete combustion state can be reliably avoided.

[0029]

Embodiments will be described below with reference to the drawings. Figure 1
1 shows a hot water supply device as an example of a combustion device according to the present invention. The hot water supply device includes a water heater Y, a control unit H that controls the operation of the water heater Y, and a remote controller R. The water heater Y is connected to the combustion chamber 1, a burner 2 provided inside the combustion chamber 1, a heat exchanger 3 for heating water, and an upper portion of the combustion chamber 1, and the combustion gas of the burner 2 is exposed to the outside. To the exhaust passage 5, the burner 2 to ventilate the combustion gas from the burner 2, and to exhaust the combustion gas of the burner 2 to the outside through the exhaust passage 5, and to the heat exchanger 3 for heating. Water supply passage 6 for supplying the above water, a hot water supply passage 7 for supplying hot water heated in the heat exchanger 3 to a hot water tap (not shown), and a fuel supply passage for supplying fuel (gas) to the burner 2. And 8 are provided.

In the water supply passage 6, the amount of water supplied to the heat exchanger 3 Qi
The water supply amount sensor 9 for detecting the
Hot water temperature sensor 1 for detecting the hot water temperature Tx for the hot water tap
0 is provided. The fuel supply passage 8 is connected to a gas supply pipe for general households, and the burner 2 is connected to the fuel supply passage 8.
An electromagnetic proportional valve 11 for adjusting the fuel supply amount Ip to the fuel cell and an on-off valve 12 for intermittently supplying the fuel are provided. An igniter 18 for igniting the burner 2 and a frame rod 19 for detecting the ignition are provided near the burner 2.

The remote control device R is connected to the control unit H by wire or wirelessly, and has an operation switch 13 for instructing to operate and stop the hot water supply device, a temperature setting switch 14 for setting a set target hot water supply temperature Ts, and various information. Display lamps 15, 16, 17, etc. for displaying are provided. The display lamp 15 is configured to display whether or not the hot water supply device is operating, and the display lamps 16 and 17 are configured to display an abnormal state as described later.

A catalytic combustion type CO sensor S as an example of an unburned component concentration detecting means is provided in the exhaust passage 5 in a state of being in contact with the combustion gas of the burner 2. The CO sensor S is configured to output an output value according to the concentration D of carbon monoxide (CO) as an unburned component contained in the combustion gas.

FIG. 2 shows the structure of the CO sensor S. The CO sensor S is a protective frame 2 made of stainless steel.
1, the sensor element 23, the temperature compensating reference element 24, and the ambient temperature T of the CO sensor S on the pedestal 22 inside
It is equipped with a temperature sensor 25 that detects _A. The sensor element 23 and the temperature compensating reference element 24 are each composed of a platinum wire carrying a catalyst, and the sensor element 23, the temperature compensating reference element 24, and the resistance elements 26 and 27 are different from those in FIG. As shown in, the bridge circuit state is connected. Then, the sensor element 23 and the temperature compensating reference element 24 have about 2
The unburned components that are heated to 00 ° C and come into contact with the surface thereof burn by catalytic action. At this time, since the catalyst carried on the sensor element 23 has selectivity for CO,
A difference occurs in the element temperatures of the sensor element 23 and the temperature compensating reference element 24. Since the resistance value of the platinum wire changes with temperature, the sensor element 23 and the temperature compensating reference element 24 increase as the CO concentration in the combustion gas increases.
There is a large difference in the resistance value of. Therefore, the output value Vs according to the CO concentration in the combustion gas is the voltage value (from the connection portion between the sensor element 23 and the temperature compensation reference element 24 and the connection portion between the resistance elements 26 and 27 in the bridge circuit ( The unit is output as a unit (volt). In addition, 28 in FIG. 2 is a connector part with the lead wire connected to the control part H.

The output value Vs of the CO sensor S has a temperature characteristic that it changes according to the ambient temperature T _A even if the CO concentration is the same. FIG. 4 shows the temperature characteristics of the output value Vs when the CO concentration D is predicted to be zero, and the solid line L1 in FIG. 4 indicates that the CO sensor S has not deteriorated (shipment The temperature characteristic of the output value Vs in the state where the CO concentration D is 0) is shown. Also, C
The output value Vs of the CO sensor S increases in a state where the solid line L1 is translated in the direction in which the output value increases as the O concentration D increases. In FIG. 4, the ambient temperature T _A is 70 to
The range of 200 ° C. corresponds to a region where the burner 2 is burning, and the range of 70 ° C. or lower corresponds to a region where combustion of the burner 2 is stopped.

When the atmospheric temperature T _A is fixed to a predetermined temperature, the CO concentration D and the output value Vs have a correlation represented by Vs = αD + β. However, α is the CO sensor S
, Β is CO when the ambient temperature T _A is a predetermined temperature.
It is an output value when the density D is predicted to be zero. FIG. 5 shows the correlation between the CO concentration D and the output value Vs, and the solid line M1 in FIG. 5 shows the correlation when the CO sensor S is not deteriorated (initial stage).

As shown by the broken lines L2 and L3 in FIG. 4, when the CO sensor S deteriorates, the output value Vs when the CO concentration D is predicted to be zero is the solid line L1.
Shows a tendency to decrease in a state of parallel movement in the direction in which the output value decreases. If the deviation of the output value Vs when the CO concentration D is predicted to be zero between the deterioration of the CO sensor S and the initial use is ΔV, the CO sensor S
The deviation ΔV tends to increase as the degree of deterioration increases. Also, the sensitivity α of the CO sensor S changes with deterioration, but between the sensitivity α and the deviation ΔV, α = α _C (1-K ₁ × ΔV) (where α _C is an initial value) It has been empirically determined that there is a correlation shown. In other words, the greater the deterioration, the lower the output value when the CO concentration D is predicted to be zero, and the lower the sensitivity α (the gentler the slope). However, K ₁ is a predetermined constant. Therefore, the correlation between the CO concentration D and the output value Vs when the CO sensor S deteriorates is represented by Vs = αD + β = α _C (1-K ₁ × ΔV) D + β.

As shown by the broken line L2 in FIG. 4, when the output value Vs when the CO concentration D is predicted to be zero decreases, the correlation between the CO concentration D and the output value Vs is As indicated by a broken line M2 in FIG. 5, similarly, as indicated by a broken line L3 in FIG.
When the output value Vs decreases when the O concentration D is predicted to be zero, the correlation between the CO concentration D and the output value Vs is as shown by the broken line M3 in FIG.

The control unit H has a combustion control means 101 for controlling the combustion operation of the burner 2 and an operation of the fan 4, and an incomplete combustion determination means 102 for determining an incomplete combustion state based on the output value of the CO sensor S. And CO when the CO concentration D is predicted to be zero at the production and shipping stage of the water heater.
A shipping reference value storage means 103 that stores in advance the output value of the sensor S as a shipping reference value V _OB , and an installation initial state determination means that determines whether or not the water heater is in the initial state when it is installed in the use position. 104 and installation initial state determination means 104
Is the initial state of installation, and the output value of the CO sensor S when the CO concentration D is predicted to be zero is set and stored as the initial reference value V _O. And an initial abnormal state determination means 106 for determining whether or not there is an initial abnormality of the CO sensor based on the deviation between the shipping reference value V _OB and the initial reference value V _O, and the initial reference value V _O is set. After that, the output value of the CO sensor S when the CO concentration D is predicted to be zero is set as the time reference value Vm every time the burner combustion integrated time reaches the set time, and is sequentially rewritten and stored. Reference value setting means 1
07, the deterioration determination means 10 for determining the deterioration of the CO sensor S based on the deviation between the reference value Vm over time and the initial reference value V _O.
8 and an integration timer 109 as an integration unit that integrates the combustion time of the burner 2. The control unit H
A remote control device R, a fan 4, a water supply amount sensor 9, a hot water supply temperature sensor 10, an electromagnetic proportional valve 11, an on / off valve 12, a CO sensor S, and a temperature sensor 25 are connected to the.

When the water supply amount Qi adjusted by the hot water supply plug and detected by the water supply amount sensor 9 reaches the set water amount, the combustion control means 101 executes the ignition control of the burner 2 so that the hot water supply temperature Tx becomes the set target hot water supply temperature Ts. The fuel supply amount Ip of the burner 2 is adjusted so that the rotation speed of the fan 4 is controlled so that the rotation speed of the fan 4 becomes a target rotation speed set in advance for the fuel supply amount Ip. The combustion of the burner 2 is stopped when the amount Qi becomes less than the set amount of water.

As described above, the CO sensor S has the temperature characteristic that it changes according to the ambient temperature T _A even if the CO concentration D is the same, so the shipping reference value storage means 1 is provided.
Reference numeral 03 is configured to store and store the output value data as the characteristic data with respect to the change of the ambient temperature T _A , that is, in the form of the map data shown by the solid line in FIG.

The initial installation state determination means 104 is configured to determine whether or not the burner 2 is in the initial combustion state after installation, whether or not it is in the initial installation state.

The initial abnormality discriminating means 106 is caused by vibrations and shocks which are generated during transportation and transportation or installation work between the time of production shipment and the time of installation at the place of use.
The initial abnormality of the sensor S is determined based on whether or not the output value of the CO sensor S is largely deviated from the shipping reference value V _OB .

The incomplete combustion discriminating means 102 basically calculates the CO concentration D based on the output value Vs of the CO sensor S by the relational expression Vs = αD + β. That is, based on the deviation ΔV between the initial reference value V _O and the elapsed reference value Vm, α
Is changed by a relational expression of α = α _C (1-K ₁ ΔV), and β is set as Vm to calculate the CO concentration D. The α _C is stored as an initial value in advance. Further, the incomplete combustion determination means 102
If the correction concentration is equal to or higher than the set concentration (for example, 1000 ppm) for a set time (for example, 20 seconds) or longer, it is determined that the incomplete combustion state is reached, and the display lamp 17
Is lit to notify the incomplete combustion state.

That is, the incomplete combustion discriminating means 102 calculates the CO concentration D based on the deviation ΔV, the sensitivity α changed based on the deviation ΔV, and the output value Vs to discriminate the incomplete combustion state. Is configured. Immediately after the combustion of the burner 2 starts, a transient incomplete combustion state occurs in the combustion of the burner 2 and the CO concentration D temporarily becomes extremely high. In order not to make a determination, the incomplete combustion determination operation is not executed during the elapse of a set time (for example, 60 seconds) after the start of combustion.

Although the detailed control operation is not described, in the following control, all output values read from the CO sensor S are corrected in relation to the ambient temperature T _A. That is, the output value of the CO sensor S and the output value of the temperature sensor 25 (atmosphere temperature T _A ) are detected, and the output value and the ambient temperature at the atmosphere temperature T _A are determined by the map data stored at the time of shipment. T _A is 15
The deviation (temperature deviation) from the output value at 0 degrees is obtained, the actual output value is corrected based on this temperature deviation, and the temperature correction is always performed as the output value corresponding to the ambient temperature T _A of 150 degrees. It is configured to execute and make various comparisons by matching the comparison standard.

The control operation of the hot water supply apparatus of this embodiment will be described below with reference to the flow charts shown in FIGS. When this water heater is installed at a place of use and a power switch (not shown) provided in the water heater is turned on and the power is turned on, it is determined whether or not the setting flag is set (step 1). Since this setting flag is not set at the initial stage of installation, the routine proceeds to step 2, where the shipping reference value V _OB stored in advance in the shipping reference value storage means 103 is read and set as the first time reference value Vm (step). 2). The shipping reference value V _OB is a temperature corresponding to an ambient temperature T _A of 150 degrees in the map data stored in advance at the shipping stage. And CO
Turn on the sensor power to start energization (step 3), 2
If the ambient temperature T _A is less than 70 degrees after the lapse of a minute, the burner 2 is not combusted, and the CO concentration D is predicted to be zero. Therefore, the output value Vs of the CO sensor S at that time is The shipment reference value V _OB is compared, and if the deviation does not exceed the set amount (0.6), the output value Vs is stored as the elapsed reference value Vm, and the standby state in which combustion operation is possible ( Steps 4-8). After that, if combustion does not start even after 6 minutes have passed and the conditions for reading and storing are satisfied, the time reference value Vm is rewritten and stored again, and the CO sensor power supply is turned off (steps 9 to 9). 1
3). If hot water supply is started before 6 minutes have elapsed in step 9, the process proceeds to step 14 described later.

If the ambient temperature T _A exceeds 70 degrees, or if the deviation exceeds the set amount (0.6), it is determined that the temperature sensor 25 or the CO sensor S has an initial abnormality, and the lamp 16 is lit to indicate an abnormality, and the combustion operation of the burner 2 is prohibited until a reset operation such as turning the power switch off / on is performed (step 4).
0,41).

After that, the hot water supply is started and the water supply amount sensor 9
When the combustion start is instructed by the amount of water supply Qi detected by the above exceeds the set amount of water (step 14), CO
If the power of the sensor S is OFF, turn the power ON,
Ignition control of the burner 2 is executed (steps 15 to 1)
7). That is, the electromagnetic proportional valve 11 and the opening / closing valve 12 are opened to supply the fuel gas to the burner 2, and the igniter 1
8 is ignited, and when ignition is confirmed by the frame rod 19, the ignition operation is stopped. Then, the integration is started by the integration timer 109 and the combustion control is executed (steps 18 and 19). That is, the hot water temperature sensor 1
The hot water supply temperature Tx detected by 0 is the set target hot water supply temperature T
In order to achieve s, the solenoid proportional valve 11 is adjusted and controlled to adjust the fuel supply amount Ip of the burner 2, and the rotation speed of the fan 4 becomes a target rotation speed that is preset with respect to the fuel supply amount Ip. Thus, the rotation speed of the fan 4 is controlled. Further, in addition to the combustion control as described above, the incomplete combustion determination control as described later is executed (step 20). Step 14
If the start of combustion is not instructed and the power switch on the side of the water heater is turned off in step 2, the control ends (step 2).
1).

When the hot water tap is closed and the water supply amount Qi detected by the water supply amount sensor 9 falls below the set water amount, the solenoid proportional valve 11 and the open / close valve 12 are closed to stop the combustion of the burner 2. (Steps 22 and 23), integration timer 10
9 is stopped (step 24), and ventilation (post-purge) by the fan is executed for a set time (5 minutes) even after the combustion of the burner 2 is stopped (step 2).
5).

When one minute has elapsed after the post-purge is completed, it is judged whether or not the setting flag is set (steps 26 and 27). Since the setting flag is not set during the initial combustion, the routine proceeds to step 28, where it is confirmed that the atmospheric temperature T _A of the CO sensor S is less than 70 degrees after 50 minutes have elapsed since the end of the post purge. Then, the output value Vs of the CO sensor S at that time is read (steps 29 and 30). If the reading error does not occur and the reading is normally performed, it is determined whether the setting flag is set (step 3).
1, 32). At the time of initial combustion, since the setting flag is not set, the routine proceeds to step 33, where the deviation between the read output value Vs and the shipping reference value V _OB is the set amount (0.
If it is less than 6), it is determined to be normal, and the output value Vs at that time is determined as the initial reference value V _O in the initial state of installation.
And the time reference value V at that time
Set as m (step 34). FIG. 4 shows a case where the initial reference value V _O slightly changes with respect to the shipping reference value V _OB .

When the initial reference value V _O is set and stored, the count value N of the abnormality occurrence counter is reset,
The setting flag is set, the power of the CO sensor is turned off, the process returns to step 14, and returns to the standby state for the combustion start command (steps 35 to 37).

The control up to this point explained above is the control of the initial combustion operation of the burner 2 after installation and the operation accompanying it. Therefore, whether or not the installation is in the initial state is determined by the setting flag not being set.

In step 33, the deviation between the read output value Vs and the shipping reference value V _OB is the set amount (0.
If it exceeds 6), it is determined that the CO sensor S has an initial abnormality, and the abnormality occurrence counter is counted up (step 38). In the initial state, the count value N of the abnormality occurrence counter is 3 times or less (step 3
9) Whether the deviation between the read output value and the shipping reference value is less than the set amount (0.6) after the combustion control of the burner 2 is executed again with the setting flag not set. Is judged (steps 14 to 33), and if the count value N of the abnormality occurrence counter reaches 3 times or more, the lamp 1
6 is turned on to indicate the abnormality, and the combustion operation of the burner 2 is prohibited until the reset operation such as the OFF / ON operation of the power switch is performed (steps 40 and 41).

After the initial reference value V _O is set, even if the start of combustion is not commanded and the power switch is turned off and then the power switch is turned on again, the setting is made in step 1. Since the flag is set, the routine proceeds to step 14, where the hot water supply operation standby state is entered.

When the combustion start is commanded after the initial reference value V _O is set, the above-described combustion control and incomplete combustion determination control are executed, and when the combustion stop is commanded,
Burning of the burner is stopped and post-purge is executed (steps 14 to 25). In step 27, since the setting flag is set, the routine proceeds to step 42, where the deviation between the output value Vs of the CO sensor S and the elapsed reference value Vm after 1 minute has elapsed since the end of post-purging is the set amount (0. When the combustion integration time t of the burner 2 by the integration timer 109 exceeds the set time (50 hours) if the deterioration is not so great, 50 minutes have passed since the end of the post-purge and When it is confirmed that the ambient temperature T _A of the CO sensor S is less than 70 degrees,
The output value of the CO sensor S at that time is read (steps 43, 28 to 30). The ambient temperature of the CO sensor T _A
Is 70 degrees or more, it is determined that the temperature sensor 25 is abnormal, the lamp 16 is turned on to display the abnormality, and the burner 2 burns until the reset operation such as the OFF / ON operation of the power switch is performed. The operation is prohibited (steps 40 and 41).

If the reading error has not occurred and the reading is normally performed, it is judged whether or not the setting flag is set (step 32). At this time, since the setting flag is already set, step 44 is set. Then, the read output value Vs is compared with the initial reference value V _O by (V
If it is larger than ( ₀ −0.6) and smaller than (V ₀ +0.2), it is determined to be normal, and the output value Vs at that time is determined.
Is set and stored as a reference value Vm over time (step 45). The combustion integrated time t of the burner 2 is set to (50
If the time is exceeded, the integrated value of the integration timer 109 is reset to "0" and the abnormality occurrence counter is reset to "0" (steps 46 to 48).

In step 42, the output value Vs of the CO sensor after 1 minute has elapsed after the end of the post purge.
If the deviation between the reference value Vm and the reference value Vm over time exceeds the set amount (0.2), the routine proceeds to step 28 and steps 28 to 48 are executed regardless of the integrated combustion time.

If the deviation exceeds the set amount in step 44, it is determined that the CO sensor S is in a large deterioration state and the abnormality occurrence counter is counted up (step 38), and the number of counts is 3 or more. If it is, it is determined that the CO sensor S is greatly deteriorated, the lamp 16 is turned on to display the abnormality, and
The combustion operation of the burner 2 is prohibited until a reset operation such as an OFF / ON operation of the power switch is performed (step 4
0,41).

With the continuation of the hot water supply operation, every time the burner combustion integrated time reaches 50 hours, steps 28 to 32,
44 to 48 are executed, the elapsed reference value Vm is sequentially rewritten and stored, and the deterioration is determined based on the deviation between the output value of the CO sensor (reference reference value Vm) at that time and the initial reference value V _O. Will be.

Next, the incomplete combustion determination control will be described based on the flowchart shown in FIG. The counter C ₂ for timing is reset, and the output value Vs of the CO sensor S
Is read (steps 50 and 51). Then β = β =
Vm and set α to α = α _C (1-K ₁
ΔV) is changed according to the relational expression (step 52). Then, Vs = αD + β, that is, [Vs = α _C (1-K ₁ Δ
V) D + Vm] is used to calculate the CO concentration D (step 53).

Then, the CO concentration D is changed to a set concentration (for example,
1000 ppm), the counter C ₂ is started, and when the state in which the CO concentration D is higher than the set concentration continues for a set time (for example, 20 seconds) or more, it is determined that the incomplete combustion state, The incomplete combustion state is notified by turning on the display lamp 17, and the combustion operation of the burner 2 is prohibited until the reset operation such as the OFF / ON operation of the power switch is performed (step 54-).
58). When the CO concentration D is smaller than the set concentration in step 54, and in step 56, the CO concentration D
When the state of being larger than the set concentration does not continue for the set time or longer, the routine proceeds to step 22 and the above discrimination control is repeated until the combustion stop command is given.

In this way, it is judged whether or not it is in the initial state of installation, the initial reference value V _O of the CO sensor at that time is set, and the CO sensor is deteriorated based on this initial reference value V _O. Since it is determined that C is due to vibrations and shocks during transportation and transportation or during installation work before installation, C
Even if the output value of the O sensor deviates from the state at the time of shipment, with the error due to such causes removed,
It is possible to effectively determine the deterioration caused by the combustion of the burner.

It should be noted that the value shown as the deviation serving as the judgment reference in the deterioration judgment and the initial abnormality judgment is an example and can be changed and set as appropriate.

[Other Embodiments] (1) In the above embodiment, the time reference value Vm and the CO sensor S
Although the incomplete combustion is determined based on the output value of the CO sensor, the incomplete combustion may be determined based on the initial reference value V _O or the shipping reference value V _OB and the output value of the CO sensor. .

(2) In the above embodiment, the determination as to whether or not the installation is in the initial state is made based on whether or not the burner is in the initial combustion. However, instead of such a configuration For example, a switch or the like that is detected and activated along with the mounting and fixing work is provided at a position where the switch is mounted and fixed when it is installed, and when this switch is detected and activated, the initial determination state is set and the initial reference state is set. The initial determination state may be released once the value V _O is set.
Further, it can be implemented in various forms, such as a configuration in which the initial determination state is set in advance at the time of shipment, and once the initial reference value V _O is set, the initial determination state is canceled.

(3) In the above embodiment, after the initial combustion of the burner is stopped at the initial stage of installation, the initial reference value V
_{Although O} is set, it may be set before the initial combustion of the burner is started.

(4) In the above embodiment, the deterioration determination is executed every time when the burner combustion integrated time reaches the set time. However, instead of such a structure, for example, the burner is ignited or extinguished. The deterioration determination may be executed every time the number of times reaches the set number, or the deterioration may be determined appropriately based on an instruction means that is artificially operated.

(5) In the above embodiment, when the CO sensor is greatly deteriorated, the lamp is turned on to notify the abnormality. However, a structure for notifying the abnormality by a buzzer, a structure for using the lamp and the buzzer together, etc. Various abnormality notification methods can be used.

(6) In the above embodiment, the catalytic combustion type CO sensor was used as the unburned component concentration detecting means. However, instead of this, a semiconductor type CO sensor or an unburned type CO sensor based on the amount of oxygen in the combustion gas is used. an oxygen sensor for detecting the retardant component concentration may be performed using the sensor of the hydrogen sensor or CO ₂ sensor and various.

It should be noted that although reference numerals are given in the claims for facilitating the comparison with the drawings, the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a hot water supply device.

FIG. 2 is a sectional view of a CO sensor

FIG. 3 is a circuit configuration diagram of a CO sensor

FIG. 4 is an output value of the CO sensor when the CO concentration D is predicted to be zero.

FIG. 5 is a diagram showing an output value of a CO sensor with respect to a CO concentration D.

FIG. 6 is a flowchart of control operation

FIG. 7 is a flowchart of control operation

FIG. 8 is a flowchart of control operation

FIG. 9 is a flowchart of control operation

[Explanation of symbols]

2 burner 102 incomplete combustion determining means 104 installed initial state decision section 105 initial reference value setting means 108 deterioration determining unit 109 integrating means S unburned component concentration detection means V _O initial reference value

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP 62-266320 (JP, A) JP 6-281611 (JP, A) JP 7-324744 (JP, A) JP 6- 323538 (JP, A) Actual development 5-90148 (JP, U) Actual development Sho 63-49166 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23N 5/24 107 F23N 5/24 113

Claims (6)

(57) [Claims] 1. An unburned component concentration detection means (S) for detecting the concentration of unburned component in the combustion gas of the burner (2), and detection information of this unburned component concentration detection means (S), A combustion device provided with an incomplete combustion determination means (102) for determining incomplete combustion of the burner (2), and an installation initial stage for determining whether or not it is in an initial state installed in a use position. The unburned component concentration when the state determination means (104) and the installation initial state determination means (104) determine that the installation is in the initial state and the unburned component is predicted to be zero Initial reference value setting means (105) for setting the output value of the detection means (S) as an initial reference value (V _O ), and a state where the unburned component is zero after the initial reference value is set. Output of the unburned component concentration detection means (S) when predicted Values and, based on a deviation between said initial reference value (V _O), the unburned component concentration detection means (S) deterioration determining means (108) for determining the deterioration of the is that the combustion apparatus is provided. 2. The installation initial state determination means (104)
Is configured to determine whether or not the burner (2) is in an initial combustion state after being installed in a use position, based on whether or not the burner (2) is in an initial combustion state.
Combustion device as described. 3. The initial reference value setting means (105) is a state in which the unburned component is zero after a set time has elapsed since the combustion operation of the burner (2) in the initial combustion state was stopped. The combustion apparatus according to claim 2, wherein the output value of the unburned component concentration detecting means (S) when it is predicted that the value is set as the initial reference value (V _O ). 4. An integrating means (109) for integrating the combustion time of the burner (2) is provided, and the deterioration determining means (108) is configured so that the integrated combustion time of the integrating means (109) reaches a set time. The combustion device according to claim 1, 2 or 3, wherein the combustion device is configured to determine deterioration. 5. The deterioration determining means (108) is configured to output information for notifying an abnormality when determining that the deviation between the initial reference value and the output value exceeds a set amount. The combustion device according to claim 1, 2, 3, or 4. 6. The unburned component concentration detecting means (S) is constituted by a catalytic combustion type CO sensor.
The combustion device according to 3, 4, or 5.